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| Number | Title | Issue Date |
| 6519541 | Multiple frequency signal detector A method for characterizing a dual frequency (DF) signal including the steps of sampling the signal at a sampling frequency vs so as to obtain a sequence of signal samples, and obtaining an -constant and a ଲ-constant of the DF sign... | 02/11/2003 |
| 6502046 | Laplace transform impedance spectrometer and its measurement method A method of measuring impedance is based on carrier function Laplace transform. The measurement includes detecting a response signal from a device under test, to which signal an excitation such as a pulse, interrupt or constant load is applied. Resulting ... | 12/31/2002 |
| 6502043 | Process and device for reducing the spectral line noise inside an aircraft, especially a rotating-wing aircraft, in particular a helicopter Process and device for reducing the spectral line noise inside an aircraft, especially a rotating-wing aircraft, in particular a helicopter. Said device (1) comprises sensors (Ca, Cb) for measuring the values of vibratory and/or acoustic parameters, controllab... | 12/31/2002 |
| 6499002 | System and method for generating a noise index for a mechanical system A method and system for generating a noise index for a mechanical system in which noise data is acquired over a predetermined frequency range. A fundamental harmonic frequency is chosen and this fundamental harmonic frequency is used to mark harmonic and ... | 12/24/2002 |
| 6470285 | Method and apparatus for multi-parameter digital pulse pileup rejection A method and apparatus for rejecting signals exhibiting pulse pile-up and devices incorporating the method and/or apparatus. A pulse sensor senses pulses and an analog-to-digital converter digitizes the sensed pulses into discrete ADC values over a plural... | 10/22/2002 |
| 6424932 | Methods and apparatus for measuring spectral energy The spectral energy in the signal emitted by a mobile telephone handset is measured for portions of the signal carrying random data, both before and after a non-random midamble. By including both random portions in the measurement the time taken to perfor... | 07/23/2002 |
| 6421619 | Data processing system and method included within an oscilloscope for independently testing an input signal A data processing system and method included within an oscilloscope for independently analyzing a signal input into the oscilloscope. The oscilloscope includes a plurality of triggering modes. A plurality of trigger parameters are specified for each of th... | 07/16/2002 |
| 6418383 | Method and apparatus for iterative spectral compensation An iterative method and apparatus for correction and compensation of analytical signals, such as spectrometric data, is provided which corrects for spectral cross-talk; compensates for spectral shift; and reduces error propagation. The method and apparatu... | 07/09/2002 |
| 6397158 | Method for determining capacitance values for quieting noisy power conductors A method for determining the value of at least one capacitance required to be placed in a conductive path on a printed circuit board is disclosed. The method includes preparing a desired signal spectrum for the conductive path, preparing an actual signal ... | 05/28/2002 |
| 6389365 | Method for operating a spectrum analyzer to display a marker of a signal of interest A method for operating a spectrum analyzer to provide a marker that follows a peak from sweep to sweep in a spectrum display. The method operates on first and second measured spectrums. The first measured spectrum includes a plot of the signal amplitude a... | 05/14/2002 |
| 6385548 | Apparatus and method for detecting and characterizing signals in a communication system An apparatus and method to characterize an input communication signal as being a voice, tone or noise signal is provided. The apparatus and method involve measuring variations of pitch over time from a sampled input signal. A minimum value of Average Magn... | 05/07/2002 |
| 6374189 | Frequency analyzing device A frequency analyzing device for detecting a signal component of a predetermined analytic frequency to be analyzed in an input signal includes a multiplication circuit and an integration circuit. The multiplication circuit controls a switched capacitor ci... | 04/16/2002 |
| 6370484 | Signal analyzer having independent analysis and display scales A signal analyzer has an analysis scale and a display scale that are independently selectable. The signal analyzer receives a first representation of an applied signal and provides from the first representation at least two alternative representations. A ... | 04/09/2002 |
| 6369738 | Time domain/frequency domain data converter with data ready feature A time domain data converter with output frequency domain conversion. A data conversion circuit is operable to receive a signal in the time domain and provide an output in the frequency domain. It includes a data converter for converting data from an anal... | 04/09/2002 |
| 6366862 | System and method for analyzing signals generated by rotating machines A signal analysis system and method for analyzing an input signal acquired from a mechanical system. The mechanical system may include at least one rotating apparatus. The signal analysis system may be configured to: (a) receive samples of the input signa... | 04/02/2002 |
| 6344735 | Spectrum analyzer and spectrum measuring method using the same A power spectrum waveform is obtained by logarithmically amplifying a signal received by a frequency-sweep operation, detecting the amplified output of each frequency sweep, converting the detected output into a digital signal value in decibels, and conve... | 02/05/2002 |
| 6332116 | System and method for analyzing signals of rotating machines A signal analysis system and method for analyzing an input signal acquired from a mechanical system. The mechanical system may include at least one rotating apparatus. The signal analysis system may be configured to: (a) receive samples of the input signa... | 12/18/2001 |
| 6321169 | Equivalent circuit of inductance element, method of analyzing circuit constants, simulator, and record media An equivalent circuit and an analysis method are provided for highly accurately indicating characteristic of an inductance element wherein ferrite material is used. An equivalent circuit is used, wherein a closed circuit with resistance Rm1 and Rm2, and i... | 11/20/2001 |
| 6321170 | Method for interference current and state monitoring in rail vehicles The invention relates to a method for forming output signals of an interference current monitor or of a state monitor of an electrical rail vehicle with current being drawn from a power grid, and optionally a current also being delivered back into said po... | 11/20/2001 |
| 6317696 | Apparatus and method for detecting fluids The present invention discloses an apparatus for detecting one or more fluids, the apparatus comprising a sensor means having electrical properties dependent upon one or more of the presence and the concentration of one or more fluids, an electrical excit... | 11/13/2001 |
| 6276536 | Method of measuring ripeness and texture of vegetable or fruit and measuring instrument A method for measuring the ripeness and the texture of a fruit, the method comprising a step for applying a vibration having sequentially hanging frequencies to a fruit to be measured, a step for measuring the intensity of the vibration applied to the fru... | 08/21/2001 |
| 6249751 | Method of measuring gonio-spectral reflectance factor The present invention is a method of measuring a gonio-spectral reflectance factor to establish a gonio-spectral reflectance factor database available for a personal computer by which a highly-fine realistic 3D computer graphics image can be formed. The m... | 06/19/2001 |
| 6240372 | System for surveillance of spectral signals A method and system for monitoring at least one of a system, a process and a data source. A method and system have been developed for carrying out surveillance, testing and modification of an ongoing process or other source of data, such as a spectroscopi... | 05/29/2001 |
| 6236950 | Automatic stencil generation system and method A stencil generator for automatically constructing a stencil representative of signals having similar characteristics includes a boundary extractor and a component generator. The boundary extractor is operable to (i) receive a frequency spectrum of a sign... | 05/22/2001 |
| 6233529 | Frequency spectrum analyzer having time domain analysis function A spectrum analyzer is provided with a continuous period measurement function which continuously measures time periods of each and every cycle of an IF signal to analyze changes in frequency and time period of an input signal in a time domain. The frequen... | 05/15/2001 |
| 6208944 | Method for determining and displaying spectra for vibration signals A portable electronic vibration measurement device, detects a large number of structure-borne sound signals using a predetermined sequence of a plurality of specific individual measurements each plurality of measurements taken at a different sampling freq... | 03/27/2001 |
| 6199023 | System for removing spurious signatures in motor current signature analysis A method for removing spurious signals in a process of motor current signature analysis of an electric motor (24 or 33) includes creating an electronic model of the motor, acquiring simultaneous measurements of voltage and current at the motor, applying t... | 03/06/2001 |
| 6191571 | Measuring method by spectrum analyzer A measuring device and method use a spectrum analyzer. The spectrum analyzer comprises a display screen controlled by a processor on which a spectrum of an input signal is displayed in a frequency region on a half portion of the display screen and a noise... | 02/20/2001 |
| 6154687 | Modified cosine filters A high sample rate cosine filter eliminates DC components by summing them such that they sum to zero. A non-orthogonal cosine filter is also provided. When the cosine filter is applied for N=4 samples per cycle, the samples are separated by 90 degrees. Ho... | 11/28/2000 |
| 6108610 | Method and system for updating noise estimates during pauses in an information signal The invention relates to an improved adaptive spectral estimator for estimating the spectral components in a signal containing both an information signal, such as speech, and noise. A method and system provide for generating noise estimates and then only ... | 08/22/2000 |
| 6104984 | Automated method of frequency determination in software metric data through the use of the multiple signal classification (MUSIC) algorithm In accordance with the present invention, a method for obtaining frequency nformation about a given data set is realized. The method comprises the steps of providing a processing unit; inputting a raw data set into the processing unit; optionally removing ... | 08/15/2000 |
| 6044332 | Surface acoustic wave harmonic analysis A method for sensing and analyzing data with surface acoustic wave (SAW) devices comprises the steps of: propagating a sampling signal at a fundamental frequency through a SAW device coated for selective adsorption; measuring at least one parameter of at ... | 03/28/2000 |
| 5995914 | Method and apparatus for asynchronously measuring frequency shifted signals A method and apparatus for fast response and distortion measurement of a signal transfer device. A computer processor generates a multitone test signal of predetermined duration and stores it in a memory. The test signal is read out, converted to analog f... | 11/30/1999 |
| 5991697 | Method and apparatus for optical Doppler tomographic imaging of fluid flow velocity in highly scattering media Optical Doppler tomography permits imaging of fluid flow velocity in highly scattering media. The tomography system combines Doppler velocimetry with high spatial resolution of partially coherent optical interferometry to measure fluid flow velocity at di... | 11/23/1999 |
| 5960380 | Apparatus and methods for determining loft time and speed The invention detects the loft time and/or speed of a vehicle, such as a sporting vehicle, during activities of moving and jumping. A loft sensor detects when the vehicle leaves the ground and when the vehicle returns to the ground. A microprocessor subsy... | 09/28/1999 |
| 5960373 | Frequency analyzing method and apparatus and plural pitch frequencies detecting method and apparatus using the same A frequency analyzing method according to the invention is a method of analyzing frequency components of an original signal. The method has: a spectrum detecting step of detecting, from the original signal, energy levels of components of a predetermined n... | 09/28/1999 |
| 5950142 | Monitoring tension in tensioned longitudinally moving elongate elements The tension in an optical fiber being drawn from a preform is monitored by sensing its motion transverse to the drawing direction and analysing the sensed motion using an autoregressive time-series model to provide a power spectrum. One of the peaks of th... | 09/07/1999 |
| 5930733 | Stereophonic image enhancement devices and methods using lookup tables A stereophonic image may be enhanced by splitting the left and right input audio signals into a plurality of left and right output signals in a plurality of audio frequency bands and then generating left and right output audio signals from the left and ri... | 07/27/1999 |
| 5893899 | Method and apparatus for the display of digitized analog signal loss A method and apparatus for sampling an analog signal permits the identification of those samples in which data was lost in the sampling process. A data reference element is generated for each sample element, the data reference element having a correspondi... | 04/13/1999 |
| 5875420 | Determining machine operating conditioning based on severity of vibration spectra deviation from an acceptable state The operational condition of a machine is evaluated when the machine's vibration spectrum deviates from an acceptable state, where an acceptable state is defined by an alarm limit envelope. The amplitude of individual peaks within the machine's vibration ... | 02/23/1999 |
